Update all dependencies

This MR contains the following updates:

Package	Update	Change
PyPDF2 (source, changelog)	patch	<=2.10.7 -> <=2.10.8
certifi	patch	==2022.6.15.1 -> ==2022.6.15.2
idna (changelog)	minor	==3.3 -> ==3.4

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Release Notes

py-pdf/PyPDF2

v2.10.8

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New Features (ENH)

• Add PageObject.user_unit property (#​1336)

Robustness (ROB)

• Improve NameObject reading/writing (#​1345)

Full Changelog: https://github.com/py-pdf/PyPDF2/compare/2.10.7...2.10.8

certifi/python-certifi

v2022.6.15.2

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kjd/idna

v3.4

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